Drawing implement.



Mr/vzaazzsv G. J. PETERSEN.

DRAWING IMPLEMENT.

APPLICATION FILED OUT 24, 1910.-

1,002,749, I Patented Sept. 5, 1911.

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UNITED STATES PATENT OFFICE.

GEORGE J. PETERSEN, OF CHICAGO, ILLINOIS.

DRAWING IMPLEMENT.

To all whom it may concern:

Be it known that I, GEORGE J. PETERSEN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Drawing Implement, of which the following is aspecification.

This invention relates to devices used for drawing curved lines and theobject of the invention is to obtain an instrument by which a spiral maybe drawn from a given center. Further to obtain an instrument which canbe adjusted to automatically draw spirals diverging at different anglesfrom a circle around a given point.

I attain these objects by the mechanism illustrated in the accompanyingdrawing, in which Figure 1 is a section on line 1-1 of Fig. 2, viewed inthe direction indicated by the arrows. Fig. 2 is a side elevation of adevice embodying the invention, and Fig. 3 is a top plan View.

Similar letters refer to similar parts throughout the several views.

A is a horizontal bar.

B is a needle mounted on bar A.

C is a set screw by means of which needle point B may be secured rigidlyin an adjusted position on bar A.

D is a traveling head mounted on the bar A.

cl, cl, are rollers rotatably mounted in head D to come in contact withthe upper and lower faces of the bar A. The purpose of the rollers d isto lessen the force required to move the head D along on bar A. r

E, F, are pockets on head D.

G is a pencil or pen holder which is movably inserted in pocket E.

5 is a set screw in the cylindrical wall of pocket E, which prevents therotation of holder G in said pocket.

g is a short groove or recess in the cylmdrical wall of holder G, inwhich groove the end of the screw 9 fits. A slight up and down movementto holder G in pocket E is thus obtainable while the holder cannot turn.

H is a pencil secured in holder G and I is a spring in pocket E theupper end of which is in contact with the bottom of the pocket E and thelower end of which is in contact with the upper end of holder G. Thespring I tends to force holder G and pencil downward onto the paper orother Specification of Letters Patent.

Application filed October 24, 1910.

Patented Sept. 5, 1911.

Serial No. 588,918.

article on which a spiral is to be drawn by the device.

J is a tooth wheel rotatably mounted in stem K. Stem K may be put intopocket F and secured by set screw L in any desired position. To draw ascroll the axle j of wheel J is set at an angle to a line passingthrough needle B and pencil HQ This is well illustrated in Fig. 2 andwhen set as in said Fig. 2, in order to draw an ever enlarging scrollaround the point of needle B the device must be turned in the directionindicated by the arrow marked X on the needle B, in Fig. 2. When thewheel. J is set as illustrated in Fig. 2 and the device is turned aroundthe needle B in the opposite direction to the arrow marked X the scrolldrawn by the pencil H will converge toward said needle. By turning thestem K in pocket F from the position thereof illustrated in Fig. 2 to adilferent position a different scroll will be automatically drawn by thedevice from the one which will be drawn with said wheel adjusted asillustrated. The operation is effected by the wheel J forcing the head Dalong the bar A as the device is rotated around the point of needle B.It is of course evident that what is known as a right line drawing penmay be substituted for pencil H in holder G.

I claim,

1. A bar, a needle mounted on the bar, a head freely slidable on the barwith rollers interposed between the head and the bar, a plurality ofholders attached to said head, in combination with a stem adjustablyrotatable in one of the holders, and a marking device in the other ofsaid holders, means to yieldingly hold the marking device in a forwardposition in its holder, means to maintain the stem in an adjustedposition,

and a toothed wheel rotatably mounted in 3. A bar, a needle adjustablymounted on the bar, means to maintain the needle in an adjustedposition, a head freely slidable on the bar and a plurality of holdersattached to said head, in combination With a stem adjustably rotatablein one of the holders, means to maintain said stem in its rotatablyadjusted position in said holder a toothed Wheel rotatably mounted insaid stem, a

spring and a marking device in the remainl0 ing holder, said springarranged to yieldingly hold the marking devlce in an operative position;

GEORGE J. PETERSEN.

In the presence oit' MARTIN MATTHESEN,

CHARLES TURNER BROWN.

Copiesof this patent may be obtained for five cents each, by addressingthe Commissioner of IE'atents, Washington, D. C.

